"United States Census, 1860," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MW9S-VHS : accessed 24 January 2015), Boike De Plue in household of Martin De Plue, Town Holland, La Crosse, Wisconsin, United States; from "1860 U.S. Federal Census - Population," Fold3.com; citing p. 214, household ID 1561, NARA microfilm publication M653, National Archives and Records Administration, Washington, D.C.; FHL microfilm 805,417.